Bisset, Jim. "World War I." The Encyclopedia of Oklahoma History and Culture.
Coleman, Louis. "Thirty-sixth Infantry Division."The Encyclopedia of Oklahoma History and Culture.
Cook, Jia-Rui. "The Posters That Sold World War I to the American Public." Smithsonian.com. July 28, 2014. smithsonianmag.com/history/posters-sold-world-war-i-american-public-180952179/.
The Editors of Encyclopædia Britannica. "Machine gun." Encyclopædia Britannica. January 17, 2012. hbritannica.com/technology/machine-gun.
The Editors of Encyclopædia Britannica. "Trench warfare." Encyclopædia Britannica. June 23, 2015. britannica.com/topic/trench-warfare.
Everts, Sarah. "When Chemicals Became Weapons of War." 100 Years of Chemical Weapons. February 27, 2015. chemicalweapons.cenmag.org/when-chemicals-became-weapons-of-war.
Franks, Kenny. "Oklahoma National Guard."The Encyclopedia of Oklahoma History and Culture.
"First tank produced." History.com. history.com/this-day-in-history/first-tank-produced .
Levinson, Martin H. "World War I; The Closing Period of the Childhood of Humanity." ETC: A Review of General Semantics 72, no. 2 (April 2015): 149-156. Academic Search Premier, EBSCOhost.
Meadows, William. "Code Talkers."The Encyclopedia of Oklahoma History and Culture."Interactive WWI Timeline" National World War I Museum and Memorial. theworldwar.org/explore/interactive-wwi-timeline.
Rockoff, Hugh. "US Economy in World War I." EH.Net Encyclopedia, edited by Robert Whaples. February 10, 2008. eh.net/encyclopedia/u-s-economy-in-world-war-i/
Richard C. Rohrs, "Germans,"The Encyclopedia of Oklahoma History and Culture.
Sellars, Nigel. "Green Corn Rebellion."The Encyclopedia of Oklahoma History and Culture.
Watson, Mary Jo. "Jacobson, Oscar Brousse."The Encyclopedia of Oklahoma History and Culture.
Wilson, Linda. "War Bond Drives."The Encyclopedia of Oklahoma History and Culture.
"Surely you will fight for your [portrait of King George V] and [map of Great Britain]. Come along, boys, before it is too late." Digital image. Library of Congress. loc.gov/pictures/resourccph.3g10903/?co=wwipos.
Groesbeck, Dan S. "Shall We be more Tender with Our Dollars." Digital image. The National WWI Museum and Memorial. theworldwar.org/explore/exhibitions/current-exhibitions/posters-munitions.